Vehicle tire



July 31, 1928. .1,6-7 8,631

JJJJJJ ER WWW/ Patentecl July 31, lfn

UNITE STTESV PATENT OF JOH BARKER, OF LONDON; ENGLAND.,

VEHICLE TIRE.

' Application filed July 15, 12'7, Serial No. 205305, and in Great Britain July 12, 1926.

This invention relates to semi-s0lid tires for motor road Vehicles and like purposes, and more particularly relates to the type of tire employing perforations for the absorption of shock. At present, solidtires of this type usually have transverse circular perforation's; and although theseperforations serve the purpose of absorhing shock, the1r disadvantage is a liability forthe tire to crack 'at points connecting the perforations because there is no means of absorbing the lateral pressure through a pertoration Other than compressing the ruhber in the unperforated part. This also interferes With the proper resiliency or Shock absorbing 'tune- .tion of the tire. The Object of my nvent on is to provide a form of solid tire in which these disadvantages are obvlated and 'ln which a better resilient or cushioning effect is obtained, .and in 'accordance therew th the present invention is broadly characterized ln that the holes Or a fairproportion of them are formed With projections extend ng in- Wards relative to the holes, the pro ections being located On the side Walls of the holes Which cross the points connecting the holes, or in other words, the selected holes are formed With projections On their walls Which lie in substantially radial directions relative to the axes of the holes. 4

According to the preferred emhodiment of the .p esent invention, a tire of the type set forth comprises in combination a solid rubber body' having two sets of transverse apertures, the twon sets being' arranged alternatelv'in snccession, and one set consisting of a large hole of polygonal c'onfiguration, some or all of the sides of Which are formed with inwardly directcd projections, the other type of hole being relatively smaller.

lt is Well known With existmg forms of solid tires having' transverse circular section pcrforations that the rubber intervening each pair of perforations absorbs the "lateral Shock due toraclial pressure passing through one of the perforations When the part of the tire having the selected perforatlon is engaginsz' the road surface, the reason for this hein' that the Ordinary cylindrcal or rectangular section perforations at present einployed are spaced too Wide apart and have not the requisite configuration to fle:: readily in either lateral direetion When radial pressure is applied to the tire. This results in setting up the internal stresses -referred to With a consequent risk of the tire cracking only employs polygonal perforations, but employs in addi-,

concentrically on a line passing throughthe.

pcrforations. This present. invention 'not the ordinary cylindrical or ln the present invention, however, these sides do not meet to provide proper hexagonal apertures, but are interrupted by bulging inwards the meetingpoints ofthese two pairs of sides, Whereby each of the larger apertures has a cross section substantially after the manner of afigure 8 Or a dumbbell configuration. 4

The inwardly bulged portions are in the form of transverse lugs and their opposing Two aarallel sides of each hexap' Q upon an maginary the 'tire and passing surfaces are sufficiently spaced to ensure that they never meetwhen radial pressure is applied to the tire through the aperture. By this means I have found that whenvradial pressure is applied" through each larger the ap'erture move' away from each other, but when radlal pressure s applied through the smaller aperture, the lug-like or: .ins wardly hulged po'rtions of the part oflarger apertures each side of the small aperture move away from the smaller aperture and relieve the material of the tire of strain either sideof the smaller aperture.

Instead of making the larger aocrtures substantially figure 8 in Configuration they may each be in the form of three, limbs extending radially from a Common point. If desirech these two types of large 1 apertures may be used in combination arranged alternately, the three limhed apertures taking the place of the small apertures, or taking the place of half of the larger apertures in conjunction With the small apertures.

In order that my invention may be clearly understood and readily carried into efi'ect, I have appended hereto a sheet of drawings somewhat diagrammatically illustrating embodiments of same, and Wherein Fig; 1 is a brokenside elevation of a Solid tire.

P P ture'the lnwardly'bulged Or 'lug-likeparts of ilt) 2 is a section On 'the line E -2 of 3 is a section on the line 3 --3 of 4 is a side elevation of the tire showan exaggerated manner the compression of the tire When a large aperture is on the line of compression.

Fig. 5 shows a modified form of large hole.

Fig. 6 shows a still further modified form of large hole.

' Referring to the drawings, the small holes are indicated hy the reference letter a and it is preferred to provide each hole a With a ;air of diainetrically opposite bays arranged on a line'concentric With the axis of the Wheel and passing throngh the 'centre, of the hole a. ln addition to the bays 7) it is preferred to einpioy an inWardly direCted :projection c arranged on the outerpart of each hole :(L. Interposed between each pair Of'holes a-is a large hole d Which (in Fgs. 1-4) is preferahly of the configuration shown in Fig. 1', in Which the hole is of polygonal forrn and is provided With a pair of diametrically' opposite inWardly directed projections e of snbstantially semcircnlar cross section. Arranged on a radial line between these projections 8 is an inwardly directed 'projection f On the Outer part of the hole (Z. The proportions and arrangement of the hole d and the projections e and f are preferably suhstantially as shown in Fig. 1, 'and With such"arrangemont, When radial pressure as shown in Fig. t passes through alarge hole Cl, it has'the result of separating the projections e and moving the projection 'f inWards, so tha-t the radal Width of the hole in question 's rednced and its circumferentia'l Width is increased. The direction in Which the Walls of theselected hole d fleX is indicated by 'the arrOWs in Fig. i, the Vertical arro'W inof 'thefiarrow 72, upon the small holes a is shown in 4, in Which it Will be seen 'that the si'n'all holes absorb by the flexing of their Walls, the pressure acting in directions of the arrows h.

lVhenradial pressure instead of passing through a large hole Cl passes through #a small hole a, the large holes each side'o'f the selected small hole prevent the major portion of internal stresses of the tire by flexin In Fig. is shown a modified form o large hole d' Which is in the form of three syinnietrically arranged openings cl radiating from a common point. This confignrat'ion of hole has practically the same result as the holes d hereinbei ore referred to, nasmuch as the Walls of each opening 2 readily fiex When radial pressure is applied and also readily Conform to any 'forces acting in the direction of the arrows IL.

Having now described my invention What I claim as new and desire'to secure by Letters Patent s A solid tire 'for Vehicles, provided With two series of transversely extending openings, the Openings of one series being dispC-sed alternately With those of the other series in a line passing through the tire concentrically ith its axis of rotation, each opening of one series being of polyg'onal configuration and having oppositely disposed' inwardly 'eXtendi-ng ribs and 'each Opening of'the other series having bays in opposite side Walls thereof extending to- Ward the ribs of the Other series.

Tn testiinony Whereof I have Signed Iny name to this Specification.

v JOHN BARKER. 

